Chester Santos has been training his brain for seven years.

At 32, he’s not worried about losing his memory. He’s taking advantage of a growing market in “brain fitness” spurred by aging baby boomers.

Teenagers cramming for tests and people worried about “senior moments” can now turn to an explosion of brain-assisting video games, such as Nintendo’s Brain Age; puzzles that are said to ward off dementia, such as Sudoku and crosswords; and online tips that claim to train the brain.

Santos, the 2008 USA Memory Championship winner, can memorize a shuffled deck of cards in three minutes and learn 100 random words and 100 new names and faces in 15.

“People are capable of doing so much more with their brains than they think is possible,” says Santos, who recently quit his software job to teach his memory techniques full-time.

The brain fitness boom might seem counterintuitive in an age when technology has eased memory stress: cell phones store numbers, GPS systems give directions, Web sites store passwords and e-mail programs automatically recall used addresses.

Still, the brain fitness software market reached $225 million in revenues in 2007, according to a SharpBrains report published earlier this year, up from an estimated $100 million in 2005. The increase was driven only in part by Nintendo’s popular Brain Age game, says Alvaro Fernandez, CEO and Co-Founder of SharpBrains, a market-research firm.

“This is not just a Nintendo-fueled fad,” he says. “The brain fitness market passed a tipping point in 2007 thanks to the convergence of a very proactive boomer generation hitting their 60s.”

Hart says there is “reasonable evidence” that challenging your brain by learning new things can stave off the cognitive decline that comes with aging. But brain fitness programs differ from traditional learning by focusing on drills for specific cognitive abilities, such as concentration and retaining information.

Hart says there is no one brain “exercise” that is guaranteed to work for everyone.

That hasn’t stopped brain fitness programs from making claims. Posit Science says its computer-based programs will “help you think faster, focus better and remember more.” While some include a disclaimer, such as Cogmed Working Memory Training for kids and adults with attention deficits, many of the games do not, says Fernandez.

Some users say they feel the benefits.

Sarah Schultz, 67, of Knoxville, Maryland, says she can think faster because of Lumosity, an online brain fitness program that claims to “improve cognitive performance and maximize brain health through fun and engaging games.” She has been doing the program once a day for the past four months.

“In my age group, everybody complains they forget, that their recall isn’t good,” says Schultz, a grandmother of three. “I read. I do crossword puzzles. I just felt like I needed more.”

“I feel more alert,” she adds. “It helps me to remember things, lists, names, faces. It really helps with recall.”

Even teenagers cramming for tests are turning to brain exercises.

Raemon Matthews, a history teacher in New York City, uses some of the techniques in his curriculum and says he’s seen a difference in his students’ performance. SharpBrains estimates the K-12 market was worth $60 million in 2007, mostly for children with learning disabilities.

“It’s a tool like any other tool,” says Matthews. “Children in the 21st century are 30-second people. If you cannot grab them in that 30-second period, they become disillusioned and don’t feel they are capable of grabbing it.”

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